The Galveston Causeway is a set of causeways in Galveston, Texas, United States. Two of the routes carry the southbound and northbound traffic of Interstate 45, while the original causeway is restricted to rail traffic. It is the only free roadway access point to Galveston Island. The causeway carries traffic over Galveston Bay and the Gulf Intracoastal Waterway. The original causeway was built in 1912 and carried both rail and auto traffic. The auto traffic was transferred to new causeways built to the west in 1939, leaving the original bridge for rail traffic. The original route was listed on the National Register of Historic Places in 1976.

Rebuilding in 2003 Construction of replacement bridges for both auto routes began in 2003 with completion of the new northbound bridge in 2005. The construction of a new southbound bridge began in 2006, however Hurricane Ike delayed completion until November 2008.

2008 Hurricane damage In September 2008, the causeway flooded well before Hurricane Ike, due to the tremendous storm surge created by the very wide storm. This is in contrast to a typical hurricane, which would cause the closure of the causeway due to wind before surge. As of the early afternoon on September 13, 12 hours after official landfall, the causeway was blocked by numerous watercraft.